An Australian woman who flew to the United States to buy anonymous donor eggs and sperm to design her own baby is now creating a modern extended family for her only child.

Natalie Lovett, now 48, is a single mother to her 18-month-old daughter Lexie after making contact with a San Diego fertility clinic two years ago.

She had tried for a heartbreaking seven years to conceive a baby.

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Natalie Lovett, now 48, is a single mother to her 18-month-old daughter Lexie after making contact with a San Diego fertility clinic two years ago to buy anonymous donor eggs and sperm

'It's kind of a crazy thing, you date and you think about what you want in a partner and all of that - finding a donor is very similar,' Ms Lovett told Australian Story in an episode to air on Monday night.

'First thing is, do you physically have some sort of attraction to them? So I looked at height. I kind of chose colourings that were similar to myself.'

Ms Lovett wanted donors with tertiary qualifications and excluded those who have family members with addictions.

The San Diego fertility clinic where she had the embryo transfer contacted Ms Lovett in February to ask what she wanted to do with her remaining embryos.

'Destroying the embryos just wasn't really an option. It was just something I could never bring myself to do. I'd rather give them a great home and a great life.' she said.

Natalie Lovett had tried for a heartbreaking seven years to conceive a baby. She tried to find an egg donor in Australia by asking her sister and cousins but she wasn't successful

The San Diego fertility clinic where she had the embryo transfer contacted Ms Lovett in February to ask what she wanted to do with her remaining embryos. She is giving away her excess embryos to help childless people

Ms Lovett came up with an unconventional solution - to create a modern extended family for her only child.

'I have one perfect daughter and then I'm told I have another 25 embryos that I can either destroy, donate to science or give away,' she said.

'I could never destroy them so I decided to give them to other childless families.'

So far Mr Lovett has three embryo recipients and two are now pregnant, including a South Australian woman.

Lexie could have as many as 10 embryo siblings in the future.

'I am not alone there are lots of Australians going overseas to create a child,' Ms Lovett said.

'Some are using surrogacy or egg or sperm donor, or both. I tried to find an egg donor here in Australia. I mean I approaching my sister, cousins, my second cousins. But I just wasn't successful.'

Natalie Lovett wanted donors with tertiary qualifications and excluded those who have family members with addictions. She chose colourings similar to herself and looked at characteristics like height

The anonymous egg donor Ms Lovett paid was in her mid-twenties and considered very fertile.

Kate Bourne from the Victorian Assisted Reproductive Treatment Authority said Australian fertility clinics were not allowed to use anonymous donors and could not be paid.

'I think baby lust is very strong and very powerful, and so people desperately want to become parents. Some people will go to great lengths to travel anywhere to meet that need,' Ms Bourne said.

She said anonymous donors were not considered best practice as many donor conceived children want the choice to meet their donors.